Malicious PDF — malware analysis report

Static analysis result for SHA-256 887665c1a5b4162b…

MALICIOUS

PDF

82.8 KB Created: 2021-07-30 00:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a45ec7fda40c9ae67916fd9e3aeeb392 SHA-1: fd981266fda386d69109e84a53859e47c791e8f7 SHA-256: 887665c1a5b4162be4bd7725454ab58b9902e151c96383d42e2301782cedb466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f99235ff9fbf6f31c205f8d9063697ef/79225291363.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e87ff480d53---48672705133.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/sibatosodero.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/vapib.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/vusiniwilez.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/38ca804d4e80ab24e3818687396fc655/kisozilavunufen.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/62563938574.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/detinekizok.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/48669663602.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/lajeroxegeneluniguwifi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/lasejaxugajaf.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5baf620cc66e5a52842035549b9ceb87/13339533135.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d9f59ff1---71246340119.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jiuhc47pv6ch0k2k1oome62e26/jolegijupet.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14c9bbe7195128446f4973b9c47d0eed/jotap.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/64908586285.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21745d46fc---pijeti.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xebaxijaladegizasadofuwa.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/070b880be79844fee82417d4b43b793f/10041030900.pdfIn PDF document text
    • http://dgjst.com/upfile/file/biwivevakovukisagatal.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/030837171693.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/78094396084.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uq4tfgu4g9a33j5dncb4aia2ft/1313226071.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mennekes+type+2+ev+charging+station+wall-mount+cable+wrapPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 17680 bytes
SHA-256: 2e6c22f6fe8c63f5e0d28dd8c4a247ed43d8a96585359ad44c3f8f61a539f168
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 11564 bytes
SHA-256: 7fd8c859c8f2db03f9a4f6c9c8d1aaa63c3d88ea0850f9d70a70a36981ca80aa

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